Speed change device and power system

Abstract

The invention relates to the technical field of transmissions, and discloses a speed change device and a power system. The second input shaft is in transmission fit with the first input shaft; the third input shaft is in transmission fit with the first input shaft; the first output shaft is in transmission fit with the second input shaft and the third input shaft; the first output shaft or the second input shaft is detachably connected with the first transmission assembly through the first clutch; the first output shaft or the third input shaft is detachably connected with the second transmission assembly through the second clutch; according to the speed change device, the mode that the double parallel shafts are coupled with the planet wheel assembly is adopted to achieve power transmission, four-gear transmission can be achieved after power coupling, the power performance can be effectively improved, the transmission requirement can be met through low torque output at the parallel shafts, and the transmission efficiency is improved. And the working stability and reliability of the speed change device under the heavy load condition can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and in particular to a transmission device and a power system. Background Art

[0002] With the continuous development of new energy technologies, traditional working vehicles that use engines as their core power are gradually moving towards electric and hybrid. By integrating traditional fuel technology and electric technology, hybrid working vehicles not only improve the economy and environmental protection of vehicles, but also enhance the adaptability and work efficiency of vehicles under various working conditions.

[0003] At present, existing hybrid vehicles usually use automatic transmissions that are suitable for low loads. The automatic transmission has an engine power input shaft and a motor power input shaft. The power of the two input shafts is output after coupling through a series of transmission gears and a planetary gear system. Although the hybrid effect can be achieved, this form of automatic transmission is a single-speed transmission and can only be used in low-load environments. Hybrid working vehicles have a large load and usually operate under complex road conditions. This form of automatic transmission is difficult to meet the use requirements of hybrid working vehicles. Summary of the invention

[0004] In view of this, the present invention provides a transmission device and a transmission system to solve the problem that the transmission of the existing hybrid system is difficult to effectively meet the use requirements of the hybrid working vehicle.

[0005] In the first aspect, the present invention provides a speed change device, comprising: a first input shaft, suitable for being connected to an engine through a power clutch; a second input shaft, drivingly matched with the first input shaft and suitable for being connected to a first power motor; a third input shaft, drivingly matched with the first input shaft and suitable for being connected to a second power motor; a first output shaft, drivingly matched with the second input shaft through a first transmission assembly, and the first output shaft drivingly matched with the third input shaft through a second transmission assembly; a first clutch, the first output shaft or the second input shaft being detachably connected to the first transmission assembly through the first clutch; a second clutch, the first output shaft or the third input shaft being detachably connected to the second transmission assembly through the second clutch; a planetary gear assembly, having a power input portion and a power output portion, the power input portion being drivingly connected to the first output shaft, and the planetary gear assembly having a first transmission state and a second transmission state with different transmission ratios.

[0006] Beneficial effects: the engine can input power through the first input shaft, the second input shaft and the third input shaft can separately input power of the corresponding power motor, the first input shaft can be matched with the first output shaft through the second input shaft or the third input shaft, the first output shaft transmits power through the planetary gear assembly, the speed change device realizes power transmission by coupling double parallel shafts with the planetary gear assembly, wherein the double parallel shafts can realize two-speed ratios, and the planetary gear assembly can also realize two-speed ratios, and the two can realize pure electric four-speed and hybrid four-speed transmission after coupling, and the hybrid working vehicle can flexibly select the required gear for power output according to demand, which can effectively improve the power performance. In addition, under this transmission mode, since the planetary gear assembly is the main component for reducing speed and increasing torque, the planetary gear assembly has a large torque output, and the parallel shaft can meet the transmission demand through a relatively low torque output, so the radial force received by the parallel shaft during power transmission can be effectively reduced, and the working stability and reliability of the speed change device under heavy load can be improved, which effectively solves the problem that the transmission of the existing hybrid system is difficult to effectively meet the use requirements of the hybrid working vehicle.

[0007] In an optional embodiment, the first transmission assembly includes a first transmission wheel and a first mating wheel for transmission matching, the first transmission wheel is rotatably mounted on the second input shaft, the first mating wheel is fixedly connected to the first output shaft, a first mounting seat is provided on the outer peripheral surface of the second input shaft, the outer hub of the first clutch is connected to the first mounting seat, and the inner hub is connected to the first transmission wheel.

[0008] Beneficial effects: The first transmission assembly has a simple and reliable structure. In this installation form of the first clutch, since the first transmission wheel is connected to the inner hub of the first clutch, the first transmission wheel has a smaller outer diameter to meet the connection requirements, which can reduce the complexity of the first transmission wheel.

[0009] In an optional embodiment, the second transmission assembly includes a second transmission wheel and a second mating wheel for transmission matching, the second transmission wheel is rotatably mounted on the third input shaft, the second mating wheel is fixedly connected to the first output shaft, a second mounting seat is provided on the outer peripheral surface of the third input shaft, the outer hub of the second clutch is connected to the mounting seat, and the inner hub is connected to the second transmission wheel.

[0010] Beneficial effects: The second transmission assembly has a simple and reliable structure. In this installation form of the second clutch, since the second transmission wheel is connected to the inner hub of the second clutch, the second transmission wheel has a smaller outer diameter to meet the connection requirements, which can reduce the complexity of the second transmission wheel.

[0011] In an optional embodiment, the first mating wheel and the second mating wheel are arranged along the axial direction and have different transmission radii. Among the first mating wheel and the second mating wheel, the one with a smaller transmission radius is an integral component with the first output shaft, and the one with a larger transmission radius is sleeved on the first output shaft, and / or the second input shaft and the third input shaft are located on two radially opposite sides of the first input shaft.

[0012] Beneficial effect: This arrangement of the first mating wheel and the second mating wheel can effectively reduce the steps required in the component assembly process and avoid the problem of the first output shaft structure being too complicated and difficult to manufacture.

[0013] In an optional embodiment, a first power gear is arranged on the first input shaft, a second power gear is arranged on the second input shaft, a third power gear is arranged on the third input shaft, and the first power gear is simultaneously matched with the second power gear and the third power gear.

[0014] Beneficial effect: The transmission requirement can be met by arranging a first power gear on the first input shaft, which can effectively reduce the number of transmission parts used and reduce the complexity of the device.

[0015] In an optional embodiment, the planetary gear assembly includes a sun gear, a planetary gear, a planetary carrier, a ring gear, a second fixed component and a first fixed component. The sun gear is matched with the ring gear through the planetary gear, the planetary carrier is connected to the planetary gear, the second fixed component is used to fix the sun gear, the planetary gear and the ring gear as a whole for rotation, the first fixed component is used to fix the ring gear alone, the sun gear is the power input part and is connected to the first output shaft, and the planetary carrier is the power output part.

[0016] Beneficial effects: The planetary gear assembly has a simple and reliable structure and can stably and reliably transmit power in two different transmission states.

[0017] In an optional embodiment, the second fixed component includes a third clutch and a fixed frame, the fixed frame is sleeved on the outside of the ring gear and connected to the outer hub of the third clutch, the inner hub of the third clutch is connected to the ring gear, and / or, the first fixed component includes a third mounting seat and a fourth clutch, a third mounting seat is arranged on the outer peripheral surface of the first output shaft, the outer hub of the fourth clutch is connected to the third mounting seat, and the inner hub of the fourth clutch is connected to the ring gear.

[0018] Beneficial effects: The structures of the first fixing component and the second fixing component are simple and reliable.

[0019] In an optional embodiment, the speed change device further includes a second output shaft, the second output shaft is connected to the planet carrier, and / or the first clutch and the second clutch are both wet clutches.

[0020] Beneficial effects: Power can be output stably and reliably through the second output shaft, the structure is simple and reliable, and the wet clutch is more durable, stable and not easy to wear.

[0021] In an optional embodiment, the first clutch has a first control part for controlling its own clutch state, the first control part and the first mounting seat together form a first control cavity, a first control oil circuit and a first lubricating oil circuit are provided inside the second input shaft, the first control oil circuit is connected to the first control cavity, a first control oil port connected to the first control oil circuit is provided on the outer wall of the second input shaft, and a first lubricating oil port is provided on the outer wall of the second input shaft at positions corresponding to the first clutch and the first transmission wheel, and / or, the second clutch has a second control part for controlling its own clutch state, the second control part and the second mounting seat together form a second control cavity, a second control oil circuit and a second lubricating oil circuit are provided inside the third input shaft, the second control oil circuit is connected to the second control cavity, a second control oil port connected to the second control oil circuit is provided on the outer wall of the third input shaft, and a second lubricating oil port is provided on the outer wall of the third input shaft at positions corresponding to the second clutch and the second transmission wheel.

[0022] Beneficial effects: The state control of the first clutch and the lubrication process of the main working parts can be achieved through the passage inside the second input shaft, and the structure is simple and reliable. The state control of the second clutch and the lubrication process of the main working parts can be achieved through the passage inside the third input shaft, and the structure is simple and reliable.

[0023] In a second aspect, the present invention further provides a power system, comprising: the above-mentioned speed change device; an engine connected to a first input shaft of the speed change device via a power clutch;

[0024] The first power motor is connected to the second input shaft of the speed change device; the second power motor is connected to the third input shaft of the speed change device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A cross-sectional view of a speed change device according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 An enlarged schematic diagram of the speed change device at point A shown;

[0028] Figure 3 for Figure 1 An enlarged schematic diagram of the speed change device at point B is shown.

[0029] Description of reference numerals:

[0030] 1. First input shaft; 101. First power gear;

[0031] 2. second input shaft; 201. first mounting seat; 202. second power gear; 203. first control oil circuit; 204. first lubricating oil circuit; 205. first control oil port; 206. first lubricating oil port; 207. first ring groove; 208. first sealing member;

[0032] 3. third input shaft; 301. second mounting seat; 302. third power gear; 303. second control oil circuit; 304. second lubricating oil circuit; 305. second control oil port; 306. second lubricating oil port; 307. second ring groove; 308. second sealing member;

[0033] 4. First output shaft;

[0034] 5. First transmission assembly; 501. First transmission wheel; 502. First matching wheel;

[0035] 6. Second transmission assembly; 601. Second transmission wheel; 602. Second matching wheel;

[0036] 7. First clutch; 701. First control unit; 702. First control chamber;

[0037] 8. Second clutch; 801. Second control unit; 802. Second control chamber;

[0038] 9. Planetary gear assembly; 901. Sun gear; 902. Planetary gear; 903. Planet carrier; 904. Ring gear;

[0039] 905, first fixing assembly; 9051, third mounting seat; 9052, fourth clutch;

[0040] 906, second fixing assembly; 9061, third clutch; 9062, fixing frame;

[0041] 10. Second output shaft; 11. Engine; 12. Power clutch; 13. First power motor; 14. Second power motor; 15. Power flange. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0043] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0044] According to an embodiment of the present invention, on the one hand, a speed change device is provided, including: a first input shaft 1, a second input shaft 2, a third input shaft 3, a first output shaft 4, a first clutch 7, a second clutch 8 and a planetary gear assembly 9, wherein the first input shaft 1 is suitable for being connected to an engine 11 through a power clutch 12; the second input shaft 2 is transmission-matched with the first input shaft 1, and is suitable for being connected to a first power motor 13; the third input shaft 3 is transmission-matched with the first input shaft 1, and is suitable for being connected to a second power motor 14; the first output shaft 4 is transmission-matched with the second input shaft 2 through a first transmission assembly 5, and the first output shaft 4 is transmission-matched with the third input shaft 3 through a second transmission assembly 6; the first clutch 7, the first output shaft 4 or the second input shaft 2 is detachably connected to the first transmission assembly 5 through the first clutch 7; the second clutch 8, the first output shaft 4 or the third input shaft 3 is detachably connected to the second transmission assembly 6 through the second clutch 8; the planetary gear assembly 9 has a power input part and a power output part, the power input part is transmission-connected to the first output shaft 4, and the planetary gear assembly 9 has a first transmission state and a second transmission state with different transmission ratios.

[0045] With the speed change device of the present embodiment, the engine 11 can input power through the first input shaft 1, the second input shaft 2 and the third input shaft 3 can separately input power from the corresponding power motor, the first input shaft 1 can be matched with the first output shaft 4 through the second input shaft 2 or the third input shaft 3, the first output shaft 4 transmits power through the planetary gear assembly 9, the speed change device realizes power transmission by coupling the double parallel shafts with the planetary gear assembly 9, wherein the double parallel shafts can realize two-speed ratios, the planetary gear assembly 9 can also realize two-speed ratios, and the two can realize pure electric four-speed and hybrid four-speed transmission after coupling, the hybrid working vehicle can flexibly select the required gear for power output according to the demand, and can effectively improve the power performance. In addition, under this transmission mode, since the planetary gear assembly 9 is the main component for reducing speed and increasing torque, the planetary gear assembly 9 outputs a large torque, and the parallel shaft can meet the transmission demand through a relatively low torque output, so the radial force received by the parallel shaft during power transmission can be effectively reduced, and the working stability and reliability of the speed change device under heavy load can be improved, which effectively solves the problem that the transmission of the existing hybrid system is difficult to effectively meet the use demand of the hybrid working vehicle.

[0046] Specifically, since the speed change device of this embodiment mainly uses a clutch to change the current transmission gear, compared with the sleeve shifting in the related art, the speed change device of this embodiment will not experience power interruption when shifting gears. At the same time, it is more wear-resistant and durable during long-term use.

[0047] In a possible embodiment, the first transmission assembly 5 includes a first transmission wheel 501 and a first matching wheel 502 for transmission matching. The first transmission wheel 501 is rotatably sleeved on the second input shaft 2, and the first matching wheel 502 is fixedly connected to the first output shaft 4. A first mounting seat 201 is provided on the outer circumferential surface of the second input shaft 2. The outer hub of the first clutch 7 is connected to the first mounting seat 201, and the inner hub is connected to the first transmission wheel 501. The first transmission assembly 5 has a simple and reliable structure. In this installation form of the first clutch 7, since the first transmission wheel 501 is connected to the inner hub of the first clutch 7, the first transmission wheel 501 has a smaller outer diameter to meet the connection requirements, which can reduce the complexity of the first transmission wheel 501.

[0048] It can be understood that, as a replaceable implementation, the inner hub of the first clutch 7 can also be connected to the first mounting seat 201, and the outer hub can be connected to the first transmission wheel 501, which can be flexibly selected according to needs.

[0049] Specifically, Figure 2 As shown, the first mounting seat 201 is a ring-shaped structure formed by extending and bending a portion of the outer circumference of the second input shaft 2 outward. This type of first mounting seat 201 and the second input shaft 2 are an integrated structure, which has higher structural strength and can reduce the number of components.

[0050] In a possible embodiment, the second transmission assembly 6 includes a second transmission wheel 601 and a second matching wheel 602 for transmission matching. The second transmission wheel 601 is rotatably sleeved on the third input shaft 3, and the second matching wheel 602 is fixedly connected to the first output shaft 4. A second mounting seat 301 is provided on the outer circumferential surface of the third input shaft 3. The outer hub of the second clutch 8 is connected to the mounting seat, and the inner hub is connected to the second transmission wheel 601. The second transmission assembly 6 has a simple and reliable structure. In this installation form of the second clutch 8, since the second transmission wheel 601 is connected to the inner hub of the second clutch 8, the second transmission wheel 601 has a smaller outer diameter to meet the connection requirements, which can reduce the complexity of the second transmission wheel 601.

[0051] It can be understood that, as a replaceable implementation, the inner hub of the second clutch 8 can also be connected to the second mounting seat 301, and the outer hub can be connected to the second transmission wheel 601, which can be flexibly selected according to needs.

[0052] Specifically, Figure 3 As shown, the second mounting seat 301 is a ring-shaped structure formed by extending and bending a portion of the outer circumference of the third input shaft 3 outward. This type of second mounting seat 301 and the third input shaft 3 are an integrated structure, which has higher structural strength and can reduce the number of components.

[0053] Furthermore, the first transmission wheel 501, the first matching wheel 502, the second transmission wheel 601 and the second matching wheel 602 are all transmission gears. The first transmission wheel 501 and the second transmission wheel 601 can be transmitted by being sleeved on the corresponding input shaft. Compared with the transmission form in which the first transmission wheel 501 and the second transmission wheel 601 are both independent transmission shafts, the first transmission wheel 501 and the second transmission wheel 601 under this sleeve relationship can improve the compactness of the overall device, reduce the axial size of the first transmission wheel 501 and the second transmission wheel 601 and the required space, and make the volume of the speed change device smaller.

[0054] In a possible embodiment, the first mating wheel 502 and the second mating wheel 602 are arranged along the axial direction and have different transmission radiuses. Among the first mating wheel 502 and the second mating wheel 602, the one with a smaller transmission radius is an integral component with the first output shaft 4, and the one with a larger transmission radius is sleeved on the first output shaft 4. This arrangement of the first mating wheel 502 and the second mating wheel 602 can effectively reduce the steps required in the component assembly process and avoid the problem of the first output shaft 4 being too complicated and difficult to manufacture.

[0055] Specifically, Figure 1As shown, the first input shaft 1 and the first output shaft 4 are coaxially arranged, and the first mating wheel 502 and the second mating wheel 602 are arranged in sequence along the direction away from the first input shaft 1, wherein the transmission radius of the second mating wheel 602 is smaller than the transmission radius of the first mating wheel 502, and the second mating wheel 602 and the first output shaft 4 are an integral component. Since the transmission radii of the first mating wheel 502 and the second mating wheel 602 are different, the transmission matching positions of the two are radially misaligned, and the two will not interfere with each other during transmission matching. Therefore, the first mating wheel 502 and the second mating wheel 602 can be arranged closer and tightly, which can further reduce the axial size of the speed change device.

[0056] In a possible implementation, the second input shaft 2 and the third input shaft 3 are located on two radially opposite sides of the first input shaft 1. This input shaft arrangement can make the force on the first input shaft 1 more balanced during transmission. In addition, the second input shaft 2, the first input shaft 1 and the third input shaft 3 are arranged in sequence along the radial direction, and the second input shaft 2 and the third input shaft 3 are spaced apart at a large distance along the circumferential direction, which is convenient for assembly and inspection and maintenance.

[0057] In a possible implementation, a first power gear 101 is provided on the first input shaft 1, a second power gear 202 is provided on the second input shaft 2, and a third power gear 302 is provided on the third input shaft 3. The first power gear 101 is simultaneously coordinated with the second power gear 202 and the third power gear 302 for transmission. By providing a first power gear 101 on the first input shaft 1, the transmission requirements can be met, the number of transmission components used can be effectively reduced, and the complexity of the device can be reduced.

[0058] It can be understood that, as a replaceable embodiment, two first power gears 101 can also be provided on the first input shaft 1, and the second power gear 202 and the third power gear 302 are respectively matched with the corresponding first power gear 101 for transmission. The first power gear 101 in this arrangement can also change the transmission ratio by changing the transmission radius of the corresponding first power gear 101.

[0059] In a possible implementation manner, the planetary gear assembly 9 includes a sun gear 901, a planetary gear 902, a planetary carrier 903, a ring gear 904, a second fixed assembly 906, and a first fixed assembly 905. The sun gear 901 is matched with the ring gear 904 through the planetary gear 902, the planetary carrier 903 is connected to the planetary gear 902, the second fixed assembly 906 is used to fix the sun gear 901, the planetary gear 902, and the ring gear 904 as a whole for rotation, the first fixed assembly 905 is used to fix the ring gear 904 alone, the sun gear 901 is a power input part and is connected to the first output shaft 4, the planetary carrier 903 is the power output part. When the speed change device is working, only one of the first fixed component 905 and the second fixed component 906 performs the fixing work. When the first fixed component 905 fixes the ring gear 904, the first output shaft 4 drives the planetary gear 902 and the planetary carrier 903 to output power through the sun gear 901. At this time, the transmission is relatively large, which is the first transmission state. When the second fixed component 906 is fixed, the first output shaft 4 drives the planetary gear 902, the planetary carrier 903 and the ring gear 904 to rotate together through the sun gear 901. At this time, the transmission is relatively small, which is the second transmission state.

[0060] Among them, there is no limitation on the fixing form of the second fixed component 906. It can be to fix the first output shaft 4 with the ring gear 904, to fix the first output shaft 4 with the planet carrier 903, to fix the sun gear 901 with the planet carrier 903, or to fix the sun gear 901 with the fixed ring gear 904, as long as the sun gear 901, the planet gear 902 and the planet carrier 903 can rotate as a whole.

[0061] In a possible embodiment, the second fixed component 906 includes a third clutch 9061 and a fixed frame 9062. The fixed frame 9062 is sleeved on the outside of the ring gear 904 and connected to the outer hub of the third clutch 9061. The inner hub of the third clutch 9061 is connected to the ring gear 904. The second fixed component 906 has a simple and reliable structure.

[0062] In a possible embodiment, the first fixed component 905 includes a third mounting seat 9051 and a fourth clutch 9052. The third mounting seat 9051 is arranged on the outer peripheral surface of the first output shaft 4. The outer hub of the fourth clutch 9052 is connected to the third mounting seat 9051. The inner hub of the fourth clutch 9052 is connected to the ring gear 904. The structure of the first fixed component 905 is simple and reliable.

[0063] It can be understood that, as a replaceable embodiment, the inner hub of the fourth clutch 9052 can also be connected to the third mounting seat 9051, while the outer hub is connected to the ring gear 904, which can be flexibly selected according to needs.

[0064] Specifically, Figure 1 As shown, the third mounting seat 9051 is a separate component, which is connected to the outer circumferential surface of the first output shaft 4 through an assembly step.

[0065] In a possible implementation, the speed change device further includes a second output shaft 10, and the second output shaft 10 is connected to the planet carrier 903. The power can be output stably and reliably to the outside through the second output shaft 10, and the structure is simple and reliable.

[0066] In a possible implementation, both the first clutch 7 and the second clutch 8 are wet clutches, which are more durable and reliable.

[0067] Specifically, the third clutch 9061 is also a wet clutch; the fourth clutch 9052 is a brake.

[0068] In a possible implementation, the first clutch 7 has a first control part 701 for controlling its own clutch state, the first control part 701 and the first mounting seat 201 together form a first control cavity 702, a first control oil circuit 203 and a first lubricating oil circuit 204 are provided inside the second input shaft 2, the first control oil circuit 203 is connected to the first control cavity 702, a first control oil port 205 connected to the first control oil circuit 203 is provided on the outer wall of the second input shaft 2, and a first lubricating oil port 206 is provided on the outer wall of the second input shaft 2 at positions corresponding to the first clutch 7 and the first transmission wheel 501. The state control of the first clutch 7 and the lubrication process of the main working parts can be realized through the passage inside the second input shaft 2, and the structure is simple and reliable.

[0069] Specifically, Figure 2 As shown, a first annular groove 207 is provided on the outer peripheral surface of one end of the second input shaft 2, and first sealing members 208 are respectively provided on both sides of the first annular groove 207 along the axial direction. The first control oil port 205 is provided in the first annular groove 207. The speed change device also has a housing. The second input shaft 2 cooperates with the housing through the first sealing member 208, so that the first annular groove 207 forms a sealed cavity. The control oil port is provided on the housing to inject or suck out the control oil into or out of the first annular groove 207. The structure is simple and reliable.

[0070] In one possible embodiment, the second clutch 8 has a second control part 801 for controlling its own clutch state, the second control part 801 and the second mounting seat 301 together form a second control cavity 802, a second control oil circuit 303 and a second lubricating oil circuit 304 are provided inside the third input shaft 3, the second control oil circuit 303 is connected to the second control cavity 802, a second control oil port 305 connected to the second control oil circuit 303 is provided on the outer wall of the third input shaft 3, and a second lubricating oil port 306 is provided on the outer wall of the third input shaft 3 at a position corresponding to the second clutch 8 and the second transmission wheel 601. The state control of the second clutch 8 and the lubrication process of the main working parts can be realized through the passage inside the third input shaft 3, and the structure is simple and reliable.

[0071] Specifically, Figure 3 As shown, a second annular groove 307 is provided on the outer peripheral surface of one end of the third input shaft 3, and second sealing members 308 are respectively provided on both sides of the second annular groove 307 along the axial direction. The second control oil port 305 is provided in the second annular groove 307. The speed change device also has a housing. The third input shaft 3 cooperates with the housing through the second sealing member 308, so that the second annular groove 307 forms a sealed cavity. The control oil port is provided on the housing to inject or suck out the control oil into or out of the second annular groove 307. The structure is simple and reliable.

[0072] Furthermore, if Figure 1 As shown, the third clutch 9061 controls its own clutch state through the control oil circuit inside the first output shaft 4, an annular groove connected to the control oil circuit is provided on the outer wall of the first output shaft 4, and a control oil port is provided on the inner wall of the annular groove. The fourth clutch 9052 can be directly controlled and lubricated and cooled through the control oil channel and lubrication channel provided on the outer casing.

[0073] In addition, in a possible implementation manner, two components that are in a transmission relationship and a sleeve relationship are connected via a spline.

[0074] The gear positions of the transmission device of this embodiment are described in detail below:

[0075] Pure electric mode, such as Figure 1 As shown, when the power clutch 12 is disengaged, the engine 11 is not involved in the work. At this time, at least one of the first power motor 13 and the second power motor 14 transmits power through the corresponding input shaft; it can be a single motor working or two motors working at the same time.

[0076] Hybrid mode: Figure 1As shown, when the power clutch 12 is engaged, the engine 11 participates in the work. The engine 11 drives the second input shaft 2 and the third input shaft 3 to rotate through the first input shaft 1. By controlling the working states of the first clutch 7 and the second clutch 8, at least one of the second input shaft 2 and the third input shaft 3 can drive the first output shaft 4 to rotate. It can work as a single motor. At this time, the engine 11 can drive the non-working motor to charge to realize the range extension function.

[0077] When the power clutch 12, the first clutch 7, the second clutch 8, the third clutch 9061 and the fourth clutch 9052 are all in the disengaged state, it is the N gear.

[0078] When the first clutch 7 and the fourth clutch 9052 are in the engaged state, the second power motor 14 drives the first input shaft 1 to rotate through the third input shaft 3, and transmits its own power to the second input shaft 2 through the first input shaft 1, and the first power motor 13 transmits power to the second input shaft 2. After the power of the first power motor 13 and the second power motor 14 is coupled, it is transmitted to the first transmission assembly 5 through the first clutch 7; at this time, the first output shaft 4 is driven to rotate by the first transmission assembly 5 and transmits power to the sun gear 901. At this time, the third clutch 9061 locks the ring gear 904, and the power of the sun gear 901 is output through the planetary carrier 903 driven by the planetary gear 902. The planetary carrier 903 is connected to the second output shaft 10 through a spline, and finally outputs power through the power flange 15. The above is the transmission process of the first gear.

[0079] The specific gear position is mainly controlled by the working state of each clutch and other shifting elements. The remaining gear positions are shown in Table 1 below:

[0080]

[0081] Table 1 Coupling modes of shifting elements

[0082] Among them, it should be noted that the circle in the above table indicates that the clutch is in the engaged state, and the no circle indicates that the clutch is in the disengaged state; in the pure electric or hybrid state, the transmission ratios of the first to fourth gears decrease successively; the pure electric and hybrid states shown in the above table are both the case where the first power motor 13 and the second power motor 14 output power at the same time, or only one of the motors outputs power.

[0083] According to an embodiment of the present invention, on the other hand, a power system is provided, which includes: the above-mentioned speed transmission device, an engine 11, a first power motor 13 and a second power motor 14, the engine 11 is connected to the first input shaft 1 of the speed transmission device through a power clutch 12, the first power motor 13 is connected to the second input shaft 2 of the speed transmission device, and the second power motor 14 is connected to the third input shaft 3 of the speed transmission device.

[0084] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A speed change device, characterized in that: include: A first input shaft (1) adapted to be connected to an engine (11) via a power clutch (12); A second input shaft (2) is in driving cooperation with the first input shaft (1) and is suitable for connecting to a first power motor (13); A third input shaft (3) is in driving cooperation with the first input shaft (1) and is suitable for connecting to a second power motor (14); A first output shaft (4) is in transmission cooperation with the second input shaft (2) through a first transmission assembly (5); and the first output shaft (4) is in transmission cooperation with the third input shaft (3) through a second transmission assembly (6); a first clutch (7), wherein the first output shaft (4) or the second input shaft (2) is detachably connected to the first transmission assembly (5) via the first clutch (7); a second clutch (8), wherein the first output shaft (4) or the third input shaft (3) is detachably connected to the second transmission assembly (6) via the second clutch (8); The planetary gear assembly (9) comprises a power input part and a power output part, wherein the power input part is drivingly connected to the first output shaft (4), and the planetary gear assembly (9) has a first transmission state and a second transmission state with different transmission ratios.

2. The speed change device according to claim 1, characterized in that: The first transmission assembly (5) comprises a first transmission wheel (501) and a first matching wheel (502) for transmission matching, the first transmission wheel (501) is rotatably sleeved on the second input shaft (2), the first matching wheel (502) is fixedly connected to the first output shaft (4), a first mounting seat (201) is arranged on the outer peripheral surface of the second input shaft (2), the outer hub of the first clutch (7) is connected to the first mounting seat (201), and the inner hub is connected to the first transmission wheel (501).

3. The speed change device according to claim 2, characterized in that: The second transmission assembly (6) comprises a second transmission wheel (601) and a second matching wheel (602) for transmission matching, the second transmission wheel (601) is rotatably sleeved on the third input shaft (3), the second matching wheel (602) is fixedly connected to the first output shaft (4), a second mounting seat (301) is provided on the outer peripheral surface of the third input shaft (3), the outer hub of the second clutch (8) is connected to the mounting seat, and the inner hub is connected to the second transmission wheel (601).

4. The speed change device according to claim 3, characterized in that: The first mating wheel (502) and the second mating wheel (602) are arranged along the axial direction and have different transmission radiuses; the first mating wheel (502) and the second mating wheel (602) having a smaller transmission radius are integrated with the first output shaft (4), and the wheel having a larger transmission radius is sleeved on the first output shaft (4); And / or, the second input shaft (2) and the third input shaft (3) are located on two radially opposite sides of the first input shaft (1).

5. The speed change device according to any one of claims 1 to 4, characterized in that: The first input shaft (1) is provided with a first power gear (101), the second input shaft (2) is provided with a second power gear (202), the third input shaft (3) is provided with a third power gear (302), and the first power gear (101) is simultaneously in transmission cooperation with the second power gear (202) and the third power gear (302).

6. The transmission device according to any one of claims 1 to 4, characterized in that: The planetary gear assembly (9) comprises a sun gear (901), a planetary gear (902), a planetary carrier (903), a ring gear (904), a second fixed assembly (906) and a first fixed assembly (905); the sun gear (901) is coupled with the ring gear (904) through the planetary gear (902); the planetary carrier (903) is connected to the planetary gear (902); the second fixed assembly (906) is used to fix the sun gear (901), the planetary gear (902) and the ring gear (904) as a whole for rotation; the first fixed assembly (905) is used to fix the ring gear (904) alone; the sun gear (901) is the power input part and is connected to the first output shaft (4); the planetary carrier (903) is the power output part.

7. The speed change device according to claim 6, characterized in that: The second fixing assembly (906) comprises a third clutch (9061) and a fixing frame (9062), wherein the fixing frame (9062) is sleeved on the outside of the gear ring (904) and connected to the outer hub of the third clutch (9061), and the inner hub of the third clutch (9061) is connected to the gear ring (904). And / or, the first fixed component (905) includes a third mounting seat (9051) and a fourth clutch (9052), the third mounting seat (9051) is arranged on the outer peripheral surface of the first output shaft (4), the outer hub of the fourth clutch (9052) is connected to the third mounting seat (9051), and the inner hub of the fourth clutch (9052) is connected to the ring gear (904).

8. The speed change device according to claim 6, characterized in that: The speed change device further comprises a second output shaft (10), wherein the second output shaft (10) is connected to the planet carrier (903). And / or, the first clutch (7) and the second clutch (7) are both wet clutches.

9. The speed change device according to claim 3, characterized in that: The first clutch (7) has a first control part (701) for controlling its own clutch state, the first control part (701) and the first mounting seat (201) together form a first control cavity (702), a first control oil circuit (203) and a first lubricating oil circuit (204) are provided inside the second input shaft (2), the first control oil circuit (203) is connected to the first control cavity (702), a first control oil port (205) connected to the first control oil circuit (203) is provided on the outer wall of the second input shaft (2), and a first lubricating oil port (206) is provided on the outer wall of the second input shaft (2) at a position corresponding to the first clutch (7) and the first transmission wheel (501), And / or, the second clutch (8) has a second control unit (801) for controlling its own clutch state, the second control unit (801) and the second mounting seat (301) together form a second control chamber (802), a second control oil circuit (303) and a second lubricating oil circuit (304) are provided inside the third input shaft (3), the second control oil circuit (303) is connected to the second control chamber (802), a second control oil port (305) connected to the second control oil circuit (303) is provided on the outer wall of the third input shaft (3), and a second lubricating oil port (306) is provided on the outer wall of the third input shaft (3) at a position corresponding to the second clutch (8) and the second transmission wheel (601).

10. A power system, characterized in that: include: The speed change device according to any one of claims 1 to 9; An engine (11) is connected to the first input shaft (1) of the transmission device via a power clutch (12); A first power motor (13) connected to the second input shaft (2) of the speed change device; The second power motor (14) is connected to the third input shaft (3) of the speed change device.

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